Tapping attachment for boring-machines.



J. F. HALSTEAD.

TAPPING ATTACHMENT FOR BORING MACHINES.

APPLHzATIoN man AP11.21. 1917..

Patented Mar. 26, 1918L 2 SHEETS-SHEET 1.

INENT'Q'R ATTORNEY J. F. HALSTEAD.

TAPPING ATTACHMENT FOR BORING MACHINES.

APPLICATION `Hman APR.21.1917.

2 SHEETS-SHEET 2.

1,260,896. Patented Mar. 26, 1918.

l w. /5/ T A 42 j l 35 64 5' as v 40 44. a 1+ l r`ldNvENTo 56 /3 25 l BYATTORNEY VTo all 'whom t may concern.'

JOHN F. HALSTEAD, or BROOKLYN, NEW YORK, AssIeNon ro waHLs'rnoM TOOLCOMPANY, YOF NEW YORK,N. Y., A CORPORATION or NEW YORK.

TAIPPING ATTACHMENT FOR BORING-MACHINES.

Patented Mar. 2e, 191s.

Application filed April 21, 191'?. Serial No. 163,558.

Be it known that I, JOHNF.` HALsrEAD, a citizen of the Unitedk States,residing at Brooklyn, county of Kings. and State of NewYork, haveinvented a new and useful Improvement in Tapping Attachments forBoring-Machines, of which the following is a specification.

This invention relates to animprovement in tapping attachments forboring machines and it has for its main object the production` of adevice of this general character capable of use for tapping holes inmaterial differing in its resistance to a tapping operation, such forinstance as in cast iron, steel, and other relatively soft or hard mayterials. Another object is the production of t a device which is simple,durable, compact and highly efficient for `the purposes in-4 tended.With these and other `objects not speciiically mentioned, the inventionconsists in certain parts, constructions and combinations which will behereinafter Yfully described and then specifically pointed out in theclaims hereunto appended.

In the accompanying drawings, which form a part of this specificationand in which like characters of reference indicate the same or likeparts, Figure l is a plan view of a structure constructed in accordancewith the invention with 'certain parts removed and other parts shown 'insection, the section being taken on the line 1-.1 in Fig. 2; Fig. 2 is asectional elevation of the structure shown in Fig. 1 taken on the line2-2 in Fig. l; Fig. 3 is a sectional view of the same structure taken onthe line 3-3 in Fig. 4; and Fig. 4 is a sectional view taken on the line4-4 in Fig. 3.

In carrying the invention into effect there is provided a drivingspindle, a driven spindle, Aand mechanism comprising a pair ofoppositely rotating countershafts provided with alternately actinginterrupted gears of different effective amplitude, and an operatinggear for Oscillating the driven spindle, the function of this structurebeing the production of an oscillatory movement of the driven spindleand a vtap supported thereby, the forward oscillations being in excessof the backward oscillations, so that the tap will be cleared of chipswhen operat-` ing in a hard substance such as steel. In certainconstructions, there is further provided one-way driving 'connectionsfor said direction,

. with said shafts.

spindles and means forshifting the operating gear from engagement withthe interrupted gears into position to cause the operation of theone-way driving connections, the function of this additional ,structurebeing to cause the rotation of the driven spindle-and a tap carriedtherebyf-in one tively soft Vmaterial such as cast iron which does notrequire oscillation of the driven spindle and the tap to clear the tapof chips.

In the best constructions, there is further provided means for movingthe operating gear into and out of engagement with the interruptedgears, and the rotating countershafts derive their motion directly fromthe driving spindle. In the best constructions also the interruptedgears are operative in the same planes and are located between thecountershaft ends and are integral In the best constructions also, theone-way driving means comprises a clutch member driven by the drivingspindle and a coperating clutch member carried by the operating gear.Tap withdrawing means are also provided, and in the best constructionsthis tap withdrawingmeans comwhen the tap is working in a relaprises areverse running` device having a clutch member formed thereon and acoperating clutch member carried by the driven spindle. In the bestconstructions also, the driven spindle is provided with a plurality ofsplines and the rotation of the spindle is effected by means engagingsaid splines, and additional means are provided for engaging saidsplines to reverse the rotation of said spindle to cause the withdrawalof a tap. In the best constructions also, means are provided formaintaining a constant lpacedV relation between the rotating means orrunning means for causing the withdrawal of` atap. All of the abovemeans, mecha'- nism, devices and parts may be varied in constructionwithin wide limits without departing from the scope of the claims.

The structure selectedto illustrate the inindependent use is 95 thedriven spindle and thefreversew Referring to the drawings, 5 indicates idriving i spindle vhaving a tapered shank whereby it may be connected toa boring machine from which it derives its motion. The driving spindle 5is provided with afiange 6 anda reduced end 7 beyond which there is afurther reduced end provided with a thread and marked 8. The end S isthreaded into the hub 9 of a gear 10, the hub being jonrnaled in abossll rising from a plate 12 which forms the"v cover of a casing 13,which casing inc'loses the major part of the mechanism to be'hereinafterdescribed. i The threaded connection of the end 3 of the hub 9 and thebearing of the flange G upon the end of said hub insures the rotationofthe gear 10 with the driving spindle 5, and the iiange 6 and the` gear10 bearing upon the ends of the hub 11 serve to retain the parts inproper relation for operation. The threaded hole 14 in the cover 12 isprovided, and in thishole an oilcup may bescrewed. A hole 15 runningfrom the bottom `of the threaded hole 14 serves as a conduit for oil,and a hole 1G bored in the hub 9 serves as an oil conduit leading to anaperture on the axis of the hub 9 and gear 10, in which the upper end ofa driven spindle 17 is mounted to rotate and to slide.' The lower faceofthe gear l() is provided with integral clutch members 18, the purpose ofwhich will be hereinafter described. The driven spindle 17 is also jou'rnaled in a hub 19 formed in the bottom of the casing 13' beforereferred to. The driven spindle projects below the casing and upon theprojecting end maybe secured af chuck which inturn will support a tap.

Meshing with the` gear 10 is a gear 20 formed integrally upon acountershaft 21, which countershaft is journaled in a boss 22 formed onthe cap 12 before referred to, and-ina boss. 23 formed on the bottom ofthe casing 13. This countershaft 21 is further provided with an integralgear 24 adjacent the boss 23, and the gear 24 is in mesh with a wideface gear 25 formed integrally on a second countershaft 26, which secondcountershaft is journaled in a boss 27 formed on the cap 12 and in aboss 28 formed on the bottom of the casing 1 3. The gear 10 rotatescontinuously and it will be readily understood that through theconnections just described, the countershafts 21 and 26 will beconstantly rotated in opposite directions. Between the ends of thecountershaft 21 is an integral interrupted gear 29 having live teethrepresenting its effective amplitude. Similarly, the countershaft 2G isprovided, between its ends and in the'same planes as the interruptedgear 29, with an integral interrupted gear 30 'having three teethrepresenting its effective amplitude.

The driven spindle 17 is provided with four splines 31 and mounted uponsaid spindle and in engagement With these splines is an operating gear32 adapted for intermittent engagement with the interrupted gears 29 andBy aninspectioir-ofiFig. 3 it will be readily understood that theoperating gear32, and consequentlythe driven spindle 17, will-when theoperating gear is in the same vplanes as the interrupted gears-beoscillated by the alternately acting interruptedV gears 29 and 30, andthat the forward oscillations will be in excess ofthe backwardoscillations. As before stated, means are provided for moving theoperating gear into and out of position to be actuated by theinterrupted gears 29 and 30. 1n vthe device selected to illustrate theinvention, this moving means includes a yoke' 33 provided with an upperflange 34 lengaging a groove 35 formed in the operating gear 32, andwith lower iiangeBG-engaging a groove 37 formed upon a. gear 38whichisin mesh withthe wide face gear 25 and therefore runs continuouslyin a direction reverse to that of the driving spindle 5. It'will bereadily understood that this yoke with its flanges engaging theoperating gear 32 and the reverse running gear 33 serves to maintain thetwo gears in constant spaced relationwhatever The yoke is provided withan aperture 39 and in this aperture is located a shifting ball 40. Theball 40 is eccentrically mounted on a short shaft 41 journaled in thesleeveV 42, which sleeve is supported by a bossl 43 formed on one sideof the casing 131 The sleeve 42 is vheld against rotation in the bossby'means of a set screw 44. r1`he sleeve is further provided with anotch 45 and this notch is engaged by a corresponding proj ection on athumb nut 46 pinned to the 'shaft 41. The shaft `41 is provided with `anenlarged head 47 against which bears one end of a spring 4S, the otherend of the spring bearing against the bottom of a suitable aperture inthe sleeve 42. By an inspection of Figs. 1 and2, it will be readilyunderstood that the thumb nut- 46 may be seized and pulled out againstthe action of the spring 4S, whereupon the shaft 41 may be rotated toshift the position of the ball 40, and consequently l'oshift theposition-of the yoke 33.

r1`he lower ends of the splines 31 serve as clutch members carried bythe driven spindie, and the reverse running gear 3S is pro vided uponits upper face with clutch meinbers 49. i V

The upper surfaceof the operating gear is provided with clutch members50 f wav driving means are used and the oscil- B u l Y latingconnections are thrown out ofaction.

Fig. 2 illustrates the parts in the position in which they will operatewhen the. device is used for tapping soft material. By an in-- spectionof this ligure, it'pwill be seen that the clutch members 18 and 50 arein engagement, and that the operating gear is moved up out of the planesofthe interrupted gears 29A and 30 and outf of the rangeof actionthereof. The clutch members 18 and 50 will therefore cooperate to rotatethe `operating' gear 32 continuously in thesame direction `as that ofthe driving spindle 5, and the operating gear 32 by means ofitsengagement with the splines 3l, (which though limited is sufficient totransmit the necessary `,power when operating in soft material), willcause a like rotation ofthe driven spindle 17 and the tap carriedthereby. l/Vhenthe tapping operation is completeythat is to say, whenthe tap reaches the bottom ofthe tap hole,

the whole device is lifted `by the liftingbar` of the boring machine,not shown.- This results in 4lifting the casing 13 and all of themechanism therein except the driven spindle 17 which of course cannotbesolifted because of the threaded engagement of the tap inthe work. Theresultof this lifting ac-` tion is the disengagement of the driven spin'dle splines 31 from the operating gear 32 and their engagement as clutchmembers vwith. the clutch members 49 `of the reverse engagement occurs,themotion of the driven,

spindle will be reversed bythe action of the reverse running gear 38 andthe tap will be Withdrawn from the work;

l/Vhen the device is to be used in tapping h holes in hard vmaterialssuch as steel, the

yoke 33 is shifted to the position shown in Fig. t, which bringstheoperating gear 32 into the planes of the interrupted gears "29 and 30and disengages the clutch members i 18 and 50. When the operating gearis in Vthis position, its full engagement withthe driven spindlesplines3l will cause the oscil-` lation of the said spindle, the forwardoscillations being in excess of the backward oscillations. When thetapping operation is complete, the whole device is lifted as in the casewhere the one-way driving connections are used. This lifting actionresults in bringing the splines 31 and the upper end of the drivenspindle 17 to the position shown by dotted lines in Figa. It will benoted Vthat this movement completely disengages the splines from theoperating gear 32 and that the driven spindle becomes clutched to thereverse running gear 38, `which in turn,

results in withdrawing the tap as in the case where the oneway drivingconnections are use Y Y What is claimed is: i

1. In a tapping attachment for boring machines, the combination with adriving spindle, of a driven spindle, and mechanism comprising a pair ofoppositely4 rotating countershafts provided with alternately actinginterrupted gears of different effective amplitude and an operatingVgear for oscillating the driven spindle.

2. `In a `tapping attachment i for boring machines, the Vcombinationwith a driving spindle,- of a driven spindle, mechanism comprising apair of oppositely rotating countershafts provided with alternatelyacting interrupted gears of different eiective amplitude and anoperating gear for oscillating the driven spindle, and means for movlngthe operating gear into and out of engagement with the interruptedgears.

3. In a tapping attachment for boring machines, the combination with adriving spindle; of a driven spindle, mechanism comprising a `pair ofoppositely rotating coun tershafts intergeared and geared to the 'driving spindle and provided with alternately acting interrupted gears ofdifferent eective amplitude and an operating gear for oscillatingthedriven spindle, and means for moving the operating gear into and out ofengagement with the interrupted gears.

4. In a tapping attachment for boring machines, thecornbination with adriving spindle, of a driven spindle, mechanism comprising a pair ofoppositely rotating coun- ,tershafts provided with alternately actinginterrupted Vgears of different eective Aarnplitudeoperativein the sameplanes and an operating gear for oscillating the driven spindle, andmeans for moving the operate ing gear into and out of the planes of andengagement with the interrupted gears.

5'. In a tapping attachment for boring machines, the combination with adriving spindle, of a driven spindle, mechanism com-V prising a pair ofoppositely rotating countershafts provided with integral alternatelyacting interrupted gears of different effective amplitude and locatedbetween the shaft ends and an operating gear for oscillating the drivenspindle, and means for moving the operating gear into and out ofengagement with the interrupted gears.

Y 6. In a tapping attachment for boring machines, the combination with adriving spindle, of a driven spindle, mechanism comprising a pair ofoppositely rotating countershafts mounted in parallelism with said`spindles and provided with alternately acting interrupted gears ofdifferent eective ramplitude andan operating gearrfor oscillating thedriven spindle, and means for moving the operating gear into and out ofengagement with the interrupted gears.

Yso

-7.-In a tapping attachment for boring machines, the combination with adriving spindle, of a driven spindle, mechanism cmprisi'ng a pair ofoppositely` rotating countershaits provided Withalternately actinginterrupted gears of different eifective amplitude and an oscillatoryoperating gear splined to the driven spindle, and means for moving theoperating gear into and out of engagement With the interrupted gears.

8. In a tapping attachment for boring machines, the vcombination with adriving spindle, of a driven spindle, mechanismV comprising a pair ofoppositely rotating countershagt'ts provided with alternately Vactinginterrupted gears of different effective amplitude and an operating gearforoscillatin'g the driven spindle, one-Way driving connections for saidspindles, and means for shifting the operating gear from engagement withthe interrupted gears into position to cause the operation of theone-Way driving connections.

9. In a tapping attachment for boring machines, the combination With adriving spindle, of a driven spindle, mechanism coniprising a pair ofoppositely rotating countershafts provided with alternately actinginterrupted gears of different eliective amplitude and an operating gearvl'or oscillating the driven spindle, one-Way driving means comprising aclutch member driven by the driving spindle and a coperating clutchmember carried by the operating gear, and

means for shifting the operating gear from engagement With theinterrupted gears into position to cause the 'engagement of said clutchmembers.

V10. In a tapping attachment for boring machines,tlie combination with adriving spindle, of a driven spindle, mechanism comprisinga pair ofoppositely rotating counter-shafts provided with alternately actinginterrupted gearsoi different effective amplitude and an operatinggearfor oscillating the driven spindle, one-Way driving connectionscomprising a clutch member carried by the driving spindle and acoperating clutch member integral with the operating gear, and means forshifting the operating gear from engagement with the interrupted gearsinto position to cause the engagement of said clutch members.

11. In a tapping attachment for boring machines, the combination With adriving spindle, of a driven spindle, mechanism' comprising a pair otoppositely rotatingA countersliafts provided With alternately actinginterrupted gears ot different effective amplitude and an operating gearfor oscillating the driven spindle, one-Way driving connectionscomprising a clutch member carried by the driving spindle and acoperating clutch memberfintegral with the operating gear, means forshifting the operating gear tromengagement With the interrupted gearsinto positionto cause theenga'gement machines, the combination ivith ladriving spindle, of a driven spindle, mechanism coinprising a pair ofoppositely rotating coun-` tershafts provided with alternatelyactinginterrupted gears of different effective amplitudeand an operating gearfor oscillating the driven spindle, and tap withdrawing means comprisinga reverse running device having a clutch member formed thereon and acoperating clutch-memberA carried by the driven spindle.

14. In'a tapping attachment for boring machines, the combination-'With adriven spindle having a` plurality of members operative-as splines andas clutchmembers, of means engaging said membersWhen- Q operating assplines for rotating 'thedriven spindle in one direction, and additionalmeans for engaging Asaid members ivhen operating as clutch ineinbers'toreverse the rotation'of said spindle to cause the With- 100 draival of atap. e

15. In a tapping attachmenttor boring, machines, the combination with a'driven spindle having a plurality of splines, of means engaging saidsplines for rotating the spindle in onedirec'tion, means foroscillatingthe spindle, selective means for controlling the oscillation `or`rotation of thespindle, and additional means for engaging said splinesto reverse said spindle to cause the Withdrawal of a tap.

16. `In a tapping attachment for boring machines, the combination with adriven spindle having a plurality of splines, of meansV engagingsaidsplines for rotating `aid spindle in one direction, reverse runningmeans for engaging said splines to reverse the rotation of the spindleto cause the withdrawal of a tap, and means'for maintaining a constantspaced relation between said rotating means and said reverse. runningmeans regardless ofy the position of the splines Withrespect to saidmeans.

17. In a tapping attachment for boring machines, the combination with adriven spindle having a plurality ofsplines, of means engaging saidsplines for rotating the spindle in one direction, reverse running meansfor engaging said splines to reverse the rotation of said spindletocause the Withdrawal of a tap, and a double flanged yoke engagingsaidrotating means and said reverse running means.V

p 18. In a tapping attachment for boring machines, the combination Witha driven spindle having a plurality of splines, of means engaging saidsplines for rotating the spindle in one direction, reverse running meansfor engaging said splines to reverse the rotation of said spindle tocanse the Withdrawal of a tap, a double flanged yoke engaging saidrotating means and said reverse running means, and means for shiftingthe position of the yoke.

copier of this patent may be obtained for ve cents 4each, by addressingthe roi-IN F. HALSTEAD..

commissioner of Patente,

Washington, D. C.

